composite script repositories

[nedtwigg]

Right now, blowdryer only accepts a single, monolithic source of scripts and properties. But it would be nice to aggregate scripts from multiple places. One way to do that would be:

blowdryerSetup {
  forPrefixes ['scala/', 'clojure/'], {
    // if a file (script, file, or prop) starts with `scala/` or `clojure/`
    // then it will come from here
    github 'diffplug/blowdryer-diffplug-experimental', 'tag', '5.7.0'
  }

  // at the bottom, you declare the fallback source
  // for the case that it didn't match any prefixes
  github 'diffplug/blowdryer-diffplug', 'tag', '2.0.0'
}